Loading-coil case



A.*H. FALK LOADING COIL "CASE June 24,1930.

Filed Nov. oifleff I Sheets-sheet 1 June 24, '1930.

A H. FALK `LOADING COIL CASE y 5 Sheets-Sheet 5 Filed Nov. 30, 1926 Patented June 24, 1930 UNETED STATES PATENT orricr;

ARTHUR H. FALK, 0F BROOKLYN, NEW YORK, ASSIGNOR TO BELL TELEPHONE LABORA. TORIES, INCORFORATED,OF NEW YORK, N. Y., A C70Rl?ORA'IIONr OF NEW YORK LOADING-COIL CASE Application led November 30, 1926. Serial No. 151,641.

This invention relates to metallic casings and more particularly to casings for enclosing loading coils or other electrical apparatus.

In connection withelectrical transmission systems, it is often necessary to locate portions of the apparatus in places where the space is more or less limited, and where they are subject to the harmful effects of the surrounding elements. In such locations it is essential to protect the electrical apparatus by protective easings. For example, loading coils are often located in manholes under city streets and therefore require careful protection. Heretofore, it has been customary to provide such protection by mounting the coils in cast-iron cases which are not only bulky, and therefore expensive, where space is at a premium, but are also subject to corrosion.

An object of the present invention is to overcome the disadvantages inherent in former casings by the use of fabricated sheet metal.

i In accordance with one embodiment of the l lsheet metal spider which is removably attached to the sheet metal partitions and the casing. The shape ef the spider is such that it may be removed from the casing without disturbing the coils or the cables attached thereto.

Some of the advantages of the sheet metal type of casing over the cast iron cases are;

greater resistance to electrolytic corrosion,'

greater imperviousness vto moisture, smaller cross section and lighter weight per'unit of potted coil, and materially reduced manufacturing cost due to the adaptability of the sheet metal to assemble in various sizes and shapes. Furthermore, the sheet metal-closures compensate for irregularities inv the shell wall, overcome the disadvantageof an overhanging flange, and hermetically seal the casing. 'The egg-crate type metallic partition provides greater shielding effect againstv cross talk and is inexpensive and simple to manufacture. The advantage of the lattice type spider is its removability from the casing without disturbing the cable connections or the coils in the easing.

A more detailed description of the invention follows and is illustrated in the accompanying drawings in which:

Fig.` 1 illustrates a welded sheet metal loading coil case made in accordance with this invention, a portion being broken away to show details of construction;

Fig. 2 is a plan view of a casing with the cover cut away to clearly illustrate the interior assembly;

Fig. 3 is a partial perspective view showing the relative positions of the lattice type spider and the metallic partition;

Fig. l illustrates a modied form of casing; and Y Fig. 5 is a plan view of a circular casing showing the assembly of parts in this type of casing. 4

' Referring to Figures 1, 2 and 3 of the drawings, a square type yof casing is shown, in which the walls are cut to the desired size from sheet metal, formed into a shell 10, having the walls fabricated by welding. A metallic base member 11 closes one end of the shell and iswelded thereto as shown at 12,

' to form a receptacle for a plurality of coil columns. A metallic partition is inserted in the casing to form individual cells for the coil columns deposited in the casing. This metallic partition comprises a plurality ofk sheet-metal members 13 and 14 having a number of equally spaced vertical slots 15 preferably extending half the length of the members. The partition members are arranged in sets so that one set of members 13 are at right angles to the other set of members 14, with the slots 15 of one set interloclred with slots of the bisecting members of the other set, to form an egg crate type of partition. The bisecting` edges of the members may be arc-welded or an angle member 16 may be spot-welded to the angular surfaces of the partition. A sheet-metal bridge member 17, having downwardly extending ends is welded to the surfaces of parallel members, to form a support for the coil columns. A metallic spindle 18 carrying a plurality of coils 19 is supportedineach cell formed by the egg crate type Vpartition and is threaded to the bridge members 17. Arranged between adjacent coils are spacers 2),"cor`isi'sting of two fibre separators between which is interposed a metal separator, landthe assem-` bled coil vunit may be surrounded by an insulating-`cover 2 1, 'such as tubing or insulating fabric. The "Yegg crate7 type partition forms an'efiicientsuport rfor the coil columns and prevents cross-tall; between adjacent -coil columns.

" mentl with theangular extension 23,' is' welded supporting spider is arranged above the assembled f'coilcfolumns'and comprises a plurality of parallel vs'h eet` 1"netal strips 22, one ofthe strips havinga downwardly extending angularextension 23. The parallel strips of the spider'are"maintained in their proper space relation by means of `tie bars 24 which arel As potwelded to the parallel members 22. Anext'ension'25 on the tie bars 24, in alineth'ere'to'. This arrangement formsa lattice type spider of rigid constructionfor supporting the spindles 18. rlhe parallel members 22,y are provided with drill'holesin alinement withfthev spindles 18, and an insulating bushing 26, is inserted in the drill holes. The spindles 18,pass through the bushings26 and are fastened to the spider vby nuts. An'upwardlyexte'ndir'igl arm 27, welded to the partition is connectedto an angular extension 28, on' thetie bar 24,v by a 'threaded screw. A plurality of supporting extensions 29 are weldedto the tie bars 24 adjacent the outer edge of the spider'and a notch 30 is formed atl its outer end. r1`he notch 30 engages a threaded screw'passing through an angular member 31 weldedto the inner surface of the shell 10, to fasten 'the complete assembly in the casing. 'This arrangement forms Van as'- sembly unit which may be easily removed froin'the casing.y A cable32 entering the' casing supplies the connections for the various groups of coils in the casing. The con structionof the spider facilitates `its removal from the casing without disturbing the connectionstothe coils'and provides an efficient arrangement for positioning thecoil assembly in the protective' casing.

The metallic closure for the casing comprises a tapered member 33, which may be of cast metal having lugs 34 for'supporting the casing. The tapered edge of the closure member 33 presses against the edge of the casing and compensates for any irregularities in the shell wall. lThe casing is hermetically sealed by welding as shown at 35. The cable passing through the closure member 33 is sealed at 36 to prevent air or moisture entering the casing and a mounting 37 attached tothe clo-' sure member surrounds the cable seal to prevent damage thereto.' The protective casing according to this invention greatly resists corrosion due to the use of sheet metal which is of uniform thickness instead of cast metal-likely to contain blow holes or slag inclusions, and the tapered closure member facilitates assembly due to its construction and overcomes the disadvantage of an overhangingV flange present'in former cases.

A-modin'ed form of casing isshown in Fig. 4 in which the metallic shell 38 is provided with taperedv closure. members 39 and` 40.

which are welded to the shell openings in a' manner similar to the casing' shown in Fig. 1. rlhe casingmay be supported either in a vertical or a horizontal position by meansof' angular mounting members 41`welded tothe outer surface of the shell.

1n Fig. 5 lis vshown the assembly of a group of coil columns in a cylindrical casing; The' shell 42 may be formed of sheet metal rolledk into a cylinder and the adjacent edges areV to theadjacent surfaces of the members'45 anda bridge member-48 is welded to the ad-Vy jacent surfaces' of the members 46, to form thelow'er supports for the coil columns 49." The metallicpartition is prevented 'from' shifting in the cylindrical casing by angular guides 50 welded to the inner surface of the shell 42. These guides are spaced at equal distances raround the shell and receive the radial partitions 46. A cas-t spider 51 sup* ports the upper ends of the coil columns and is provided'with a downwardly extending extension 52, adjacent the cable entrance. lllhe spider is attached to the casing by a supporting lug 53 welded to the casing. A

tapered cover 54 closes the cylindrical casing',

and carries al cable mounting 55, for the protection of the cable seal. A cap screw 56 in the cover 54 is provided for filling the casing with an insulating compound,

While the detail description relates to a protective casing for loading coils, the invention is not limited to this specic use but is adaptable to a wide range of uses as a hermetically sealed metallic casing.

What is claimed is:

l. In a protective casing for electrical apparatus, means for electrically shielding certain parts of said electrical apparatus from the other parts thereof, said means comprising a metallic partition comprising at least two members at right angles to each other, said members having interlocking slots in opposed relation, and reinforcing means Welded to said members.

2. In a protective casing for electrical apparatus, means for electrically shielding certain parts of said electrical apparatus from the other parts thereof, said means comprising a metallic partition comprising metallic members interlocked at right angles to each other, and a supporting bracket havmembers.

3. In a protective casing for electrical apparatus, means for electrically shielding certain parts of said electrical apparatus from the other parts thereof, said means comprising a partition comprising sheet metal members welded together -to form cells, bridge members on the ends of each cell, and a coil column supported in each cell and attached to said bridge members.

4:. In a protective casing for electrical apparatus, means for electrically shielding certain parts of said electrical apparatus from the other parts thereof, said means comprising a partition comprising a set of parallel sheet metal members, a second set of parallel members arranged at right angles to said first set, each of said members having parallel slots extending from the edges of said members, said sets of members being interlocked with the edges of one set in the same plane as the edges of the other set, angular reinforcing means connecting the bisecting surfaces of said members, and a metallic closure member for said casing, said member having a tapered edge extending inside of and in contact with the edge of said casing.

.5. The combination of a protective casing containing a plurality of coil columns with a plurality of parallel supporting members connected to said columns and casing, and connecting cross members welded to said supporting members.

6. In a protective casing containing a plurality of coil columns, a supporting spider for said coil columns comprising a pair of parallel members, an adjacent parallel member having an angular end in a plane lower than said members, tie bars welded to said members to maintain their space relation, and a link member extending from one of said members, and welded to said angular end.

ing angular extensions welded to two of said ARTHUR I-I. FALK.

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